Grinding and Sharpening: In metalworking, sandpaper can be used for grinding and sharpening several steel tools and surfaces. Coarser grits, like 36 or 60, are used to eliminate material and condition the metal. This is particularly practical for reshaping or sharpening blades, chisels, or other cutting tools. (Take note that https://www.pinterest.com/pin/1001488035878252697/